Three Piece Tap Kit, Tap Thread Size 9/16 In. -18, High Speed Steel, Bright (Uncoated), Thread Standard UNF, Thread Length 1, Overall Length 3 19/32 in, 75 Percent Thread Drill Size 12.90 mm, Thread Limit 2B, Class of Fit 3B, Thread Direction Right Hand, Number of Flutes 4. This item has been restricted from sale in the following state (s): []